نتایج جستجو برای: methyl group transfer

تعداد نتایج: 1345831  

Journal: :Journal of the American Chemical Society 2008
Stuart E Smith Jennifer M Sasaki Robert G Bergman Joseph E Mondloch Richard G Finke

Transition-metal-catalyzed cross-coupling reactions (cycle A in Scheme 1) have enjoyed wide application in organic synthesis and are now extensively used for the efficient formation of carboncarbon and carbon-heteroatom bonds.1 The synthesis of these complexes is believed to occur via intermediates containing metalheteroatom and metal-carbon bonds.1 In principle, analogous coupling reactions co...

2009
Afsaneh Zonouzi Mojtaba Biniaz Hossein Rahmani Seik Weng Ng

The mol-ecule of the title compound, C(21)H(24)BrNO(5), has a planar furan ring [maximum deviation = 0.025 (3) Å]. The carboxy-methyl group in the 3-position is nearly coplanar with this ring [dihedral angle = 7.9 (1)°], whereas that in the 4-position is nearly perpendicular to it [dihedral angle = 78.9 (1) Å].

Journal: :Journal of Japan Oil Chemists' Society 1976

Journal: :Low Temperature Physics 2009

Journal: :Proceedings of the National Academy of Sciences 1984

Journal: :Organic & biomolecular chemistry 2013
Paula Bonancía Ignacio Vayá Dimitra Markovitsi Thomas Gustavsson M Consuelo Jiménez Miguel A Miranda

The photochemical processes occurring in diastereomeric dyads (S,S)-1 and (S,R)-1, prepared by conjugation of (S)-2-(2-hydroxy-1,1'-biphenyl-4-yl)propanoic acid ((S)-BPOH) with (S)- and (R)-Trp, have been investigated. In acetonitrile, the fluorescence spectra of (S,S)-1 and (S,R)-1 were coincident in shape and position with that of (S)-BPOH, although they revealed a markedly stereoselective qu...

Journal: :Physical chemistry chemical physics : PCCP 2016
Takao Otsuka Masato Sumita Hironori Izawa Kenji Morihashi

Electron transfer (ET) states of 1-methyl-3-(N-(1,8-naphthalimidyl)ethyl)imidazolium iodide are responsible for its photophysics. Investigation of an ET state based on constrained density functional theory (CDFT) revealed that nonradiative decay from the ET excited state is mediated by the interaction of the iodine atom with the 1,8-naphthalimide or the imidazolium group.

Journal: :Chemical communications 2008
Renaud Nicolaÿ Yungwan Kwak Krzysztof Matyjaszewski

Poly(vinyl acetate)-b-polystyrene, poly(vinyl acetate)-b-poly(methyl acrylate) and poly(vinyl acetate)-b-poly(methyl methacrylate) block copolymers with low polydispersity (M(w)/M(n) < 1.25) were prepared by successive reversible addition-fragmentation chain transfer (RAFT) polymerization and atom transfer radical polymerization (ATRP) employing a bromoxanthate iniferter (initiator-transfer age...

2013
Rachel M. Smith Alistair J. Jacklin Jacqueline J. T. Marshall Frank Sobott Stephen E. Halford

The Type IIB restriction-modification protein BcgI contains A and B subunits in a 2:1 ratio: A has the active sites for both endonuclease and methyltransferase functions while B recognizes the DNA. Like almost all Type IIB systems, BcgI needs two unmethylated sites for nuclease activity; it cuts both sites upstream and downstream of the recognition sequence, hydrolyzing eight phosphodiester bon...

F.A. Longo J.F.M. Menten K.C. Zavarize L.W. Freitas M.B. Lima R. Pereira,

Betaine is donor of methyl groups and can partially replace methionine in diets for this purpose. The objective of this study was to evaluate three sources of betaine in partial substitution of methionine supplement in broiler diets. The Cobb-500 broiler chickens were allocated in a completely randomized experimental design with 5 treatments and 7 replicates of 49 birds each. The positive contr...

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